Send through multiple SMTPs
Multiple SMTP gives high-volume senders the flexibility to manage, switch and optimise across multiple sending infrastructures, all from our own platform.
One platform. Multiple sending paths.
By default, Inboxroad handles your email delivery through our own high-performance SMTP infrastructure. But different campaigns have different needs. Transactional emails require different infrastructure than marketing campaigns.
Multiple SMTP gives you full control over how, where and through what infrastructure your emails are sent.
Choose your SMTP per campaign
Stop forcing all your emails through the same connection.
With Inboxroad, besides our own SMTP server you can connect other SMTP servers to your account and choose which one you use per campaign. Switch between servers based on volume, domain, audience or sending strategy, without ever leaving the platform.
Why Multiple SMTP matters
When you send millions of emails, the stakes are higher.
One deliverability issue on a shared connection affects everything. Multiple SMTP solves that by separating your sending streams.
- Isolate marketing campaigns from transactional emails
- Protect your most important domains from high-volume sends
- Switch servers instantly when performance drops
- Test deliverability across different infrastructures
- Keep your sender reputation clean per domain
A Multiple SMTP example
Imagine sending a weekly newsletter to 500.000 subscribers while simultaneously sending transactional emails. Without Multiple SMTP, both streams share the same infrastructure. One deliverability issue affects both.
With Multiple SMTP in Inboxroad, each stream runs on its own dedicated connection. Your domains stay clean, your reputation stays intact and you switch between servers in seconds when needed.
Built for senders who take deliverability seriously
Multiple SMTP is not a feature for everyone.
It is built for senders who understand that infrastructure decisions directly impact inbox placement. For businesses that cannot afford deliverability issues. For teams that want full control over every email they send.
If you send at scale and deliverability is critical to your business, Multiple SMTP is for you.